Why Level B is the MINIMUM for 1st Entry
It comes from this requirement in OSHA’s HAZWOPER standard and has sound logic behind it… (emphasis by me) 1910.120(q)(3)(iv) Employees engaged in emergency response and exposed to hazardous substances presenting an inhalation hazard or potential inhalation hazard shall wear positive pressure self-contained breathing apparatus while engaged in emergency response, until such time that the individual…...
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